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Comparison of Gas Sorption Properties of Neutral and Anionic Metal– Organic Frameworks Prepared from the Same Building Blocks but in Different Solvent Systems

机译:用相同的构件但在不同的溶剂系统中制备的中性和阴离子金属-有机骨架的气体吸附性能比较

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摘要

Two different 3D porous metal–organic frameworks, [Zn_4O-(NTN)_2]·10DMA·7H_2O (SNU-150) and [Zn_5(NTN)_4(DEF)_2][NH_2- (C_2H_5)_2]_2·8DEF·6H_2O (SNU-151), are synthesized from the same metal and organic building blocks but in different solvent systems, specifically, in the absence and the presence of a small amount of acid. SNU-150 is a doubly interpenetrated neutral framework, whereas SNU-151 is a non-interpenetrated anionic framework containing diethylammonium cations in the pores. Comparisons of the N_2, H_2, CO_2, and CH4 gas adsorption capacities as well as the CO2 adsorption selectivity over N2 and CH4 in desolvated SNU-150' (BET: 1852 m~2g~(-1)) and SNU-151' (BET: 1563 m~2g~(-1)) samples demonstrate that the charged framework is superior to the neutral framework for gas storage and gas separation, despite its smaller surface area and different framework structure.
机译:两种不同的3D多孔金属有机框架,[Zn_4O-((NTN)_2]·10DMA·7H_2O(SNU-150)和[Zn_5(NTN)_4(DEF)_2] [NH_2-(C_2H_5)_2] _2·8DEF· 6H_2O(SNU-151)是由相同的金属和有机结构单元,但在不同的溶剂体系中,特别是在不存在和存在少量酸的情况下合成的。 SNU-150是一个双互穿的中性骨架,而SNU-151是一个非互穿的阴离子骨架,在孔中包含二乙铵阳离子。在脱溶剂的SNU-150'(BET:1852 m〜2g〜(-1))和SNU-151'(N_2,H_2,CO_2和CH4气体吸附能力以及对N2和CH4的CO2吸附选择性的比较) BET:1563 m〜2g〜(-1))样品表明,带电荷的骨架尽管表面积较小且骨架结构不同,但在储气和分离气体方面优于中性骨架。

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